Preparation of 2,4,6-trimethylbenzoic acid
AssigneeBASF SE
InventorsWolfgang Siegel, Rudolf Kropp, Jochen Schroeder
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Abstract
A process for the preparation of 2,4,6-trimethylbenzoic acid of the formula I ##STR1## in which .alpha.-chloro-2,4,6-trimethylacetophenone is reacted with an alkali hydroxide solution and chlorine in the presence of a phase-transfer catalyst at a temperature ranging from 0.degree. to 150.degree. C. and a pressure ranging from 0.01 to 50 bar, and a process for the preparation of 2,4,6-trimethylbenzoic acid I, in which .alpha.-chloro-2.4.6-trimethylacetophenone of the formula II ##STR2## is reacted with 1,3,5-trimethylbenzene and chloroacetyl chloride in the presence of a catalyst at a temperature ranging from 0.degree. to 150.degree. C. and a pressure ranging from 0.01 to 50 bar, the catalyst used being an iron oxide.
Claims4
A process for the preparation of .alpha.-chloro-2,4,6-trimethylacetophenone of formula II ##STR6## by the reaction of 1,3,5-trimethylbenzene with chloroacetyl chloride in the presence of a catalyst at a temperature ranging from 0.degree. to +150.degree. C. and a pressure ranging from 0.01 to 50 bar, wherein the catalyst used is an iron oxide.
Dependencies are inferred from the claim text.